const fp = require("lodash/fp");
const { Maybe, Container } = require("./support");

let xs = Container.of(['do', 'ray', 'me', 'fa', 'so', 'la', 'ti', 'do']);
let ex2 = () => {
    return xs.map((data) => {
        return fp.first(data);
    })
}

ex2();